单项选择题

A．A student and a professor,
B．A physicist and a biologist.
C．Two students.
D．Two professors.
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单项选择题
A．$200B．$400C．$3000D．$100
A．$200
B．$400
C．$3000
D．$100
单项选择题
A．It is the big white building.B．It is next to their building.C．It is in the school.D．It is very far from their home.
A．It is the big white building.
B．It is next to their building.
C．It is in the school.
D．It is very far from their home.
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